EP1082766B1 - Coating method for use in a process for producing high-temperature supraconductive strip conductors - Google Patents
Coating method for use in a process for producing high-temperature supraconductive strip conductors Download PDFInfo
- Publication number
- EP1082766B1 EP1082766B1 EP99944141A EP99944141A EP1082766B1 EP 1082766 B1 EP1082766 B1 EP 1082766B1 EP 99944141 A EP99944141 A EP 99944141A EP 99944141 A EP99944141 A EP 99944141A EP 1082766 B1 EP1082766 B1 EP 1082766B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip conductor
- coating
- soldering
- aluminium oxide
- solder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 239000004020 conductor Substances 0.000 title claims description 50
- 238000000576 coating method Methods 0.000 title claims description 24
- 238000000034 method Methods 0.000 title claims description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 22
- 238000005476 soldering Methods 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 14
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 11
- 229910052709 silver Inorganic materials 0.000 claims description 11
- 239000004332 silver Substances 0.000 claims description 11
- 229910000679 solder Inorganic materials 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 239000007900 aqueous suspension Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 230000001476 alcoholic effect Effects 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 claims 2
- 238000002604 ultrasonography Methods 0.000 claims 2
- 238000001035 drying Methods 0.000 claims 1
- 238000003754 machining Methods 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002887 superconductor Substances 0.000 description 6
- 238000000137 annealing Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000012876 carrier material Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 229910052574 oxide ceramic Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000009210 therapy by ultrasound Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000010943 off-gassing Methods 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/80—Constructional details
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0268—Manufacture or treatment of devices comprising copper oxide
- H10N60/0801—Manufacture or treatment of filaments or composite wires
Definitions
- the present invention relates to a coating process, that in the manufacturing process of high temperature superconductors Band conductors are used for high-temperature superconductor cables are needed.
- tape conductors are used in the manufacturing process at known to be sintered at high temperatures
- To stick together or sticking of the band leader during the necessary Avoiding annealing processes is on everyone individual strip conductors a coating of preferably aluminum oxide intended. This measure ensures that a Sticking / sticking of the individual layers / turns of this Band conductor at high temperatures of greater than 800 ° C, at which the mechanical strength of the silver is low, is prevented.
- An intermediate layer is known from EP 0803 917 A1 Produce aluminum oxide by part of the aluminum diffused to the interface between silver and alloy and there is oxidized.
- the object of the present invention is a solution specify the sticking of the tape conductors to each other during prevents glowing and soldering for later contacting the band leader relieved.
- the present invention provides a manufacturing process of tape ladders for that subsequent soldering for the purpose of contacting the strip conductor, a targeted selection regarding the aluminum oxide to be used for the necessary coating of the strip conductor hold true. It was found to be a crucial one Relief for the subsequent soldering To achieve is that one for the execution of this coating uses an alumina in aqueous suspension, where the finely divided aluminum oxide particles contained in this suspension a particle size limited to about 0.5 up to about 10 ⁇ m.
- the suspension is preferably so applied that they (initially) up to a layer thickness (maximum) about 10 ⁇ m leads on the ribbon conductor.
- the selected one aqueous suspension is brought e.g. in a continuous process on the silver matrix ribbon conductor.
- suspension aluminum oxide coating to be produced on the strip conductor so thin that it is porous.
- porosity can also serve, in particular, with the subsequent to be applied solder the material of the strip conductor electrically to contact directly without this upset To influence layer mechanically beforehand.
- the suspension as described above is on the Surface of the respective strip conductor applied and at Temperatures of more than 100 ° C, e.g. of approx. 600 ° C, in one Continuous furnace or the like. Dried.
- alumina contained in the alumina particles Contains crystal water. In the application described high temperature this means that at temperatures Outgassing of the crystal water takes place above 500 ° C, which also leads to a certain porosity of the finished aluminum oxide coating can lead. This also leads to the fact that the adhesive properties of the aluminum oxide particles of the coating on the silver surface of the strip conductor according to the invention is less solid and then, namely for the following Soldering, but also between the individual annealing treatments, through an ultrasound treatment lasting several minutes can be easily removed at the solder point can.
- the strip conductor i.e. the silver, roughen / roughen slightly before applying the suspension.
- the strip conductor i.e. the silver, roughen / roughen slightly before applying the suspension.
- stage 1 as is known, the bringing together, pressing, pulling and Like.
- stage 2 the bringing together, pressing, pulling and Like.
- this is done according to the invention Selection of alumina and process parameters to be made Coating the strip conductor with the invention aqueous aluminum oxide suspension with particle size according to the invention.
- the suspension dries out for the production of the solid coating.
- the fourth stage sees this at least once, in particular but also multiple sintering of the spirally arranged Tape leader or the tape conductor bundle.
- the fifth stage concerns the exposure of the tape conductor ends and contact soldering the strip conductors to one another and / or to the Connection part at the end of the cable.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
Die vorliegende Erfindung bezieht sich auf ein Beschichtungsverfahren, das im Herstellungsprozeß von Hochtemperatursupraleitenden Bandleitern anzuwenden ist, die für Hochtemperatur-Supraleiterkabel benötigt werden.The present invention relates to a coating process, that in the manufacturing process of high temperature superconductors Band conductors are used for high-temperature superconductor cables are needed.
Aus dem Stand der Technik
Springer- Verlag, 1990
(Konferenz-Bericht 2nd Int. Symp. on Superconductivity, 1989)
Springer publishing house, 1990
(Conference Report 2nd Int.Symp. On Superconductivity, 1989)
Aus der EP0 044 144 B1 ist es bekannt, zur elektrischen Isolation der fadenförmigen supraleitenden Leiter aus intermetallischer Verbindung gegeneinander, damit sie als Magnetspule gewickelt werden können, diese Leiter mit einer isolierenden keramischen Außenschicht zu versehen. Diese Außenschicht wird auf den Leitern in situ erzeugt, indem eine wässrige Suspension aus Natriumsilikat, Kaolin und Kalziumkarbonat aufgebracht, getrocknet und oberhalb 500°C wärmebehandelt wird.It is known from EP0 044 144 B1 for electrical insulation the filiform superconducting conductor made of intermetallic Connection against each other so that it functions as a solenoid these conductors can be wound with an insulating ceramic outer layer. This outer layer is generated on the conductors in situ by an aqueous Sodium silicate, kaolin and calcium carbonate suspension applied, dried and heat treated above 500 ° C becomes.
Aus der EP 0 322 619 A1 ist es bekannt, zwischen einem Träger aus z.B. Strontiumtitanat, aber auch aus einem Metall, und seiner Beschichtung mit einem oxidkeramischen Hochtemperatur-Supraleiterwerkstoff eine Schicht vorzusehen, die gute Haftung zwischen Träger und Beschichtung bewirkt und chemische Reaktionen und Wechselwirkungen zwischen Trägermaterial und dem oxidkeramischen Werkstoff verhindert. Für diese Zwischenschicht ist dort u.a. Aluminiumoxid vorgesehen, das als alkoholische Suspension auf der Trägeroberfläche aufgebracht wird und zwecks dauerhafter Verbindung mit dem Trägermaterial bei 950°C gesintert wird.It is known from EP 0 322 619 A1 between a carrier from e.g. Strontium titanate, but also from a metal, and its coating with an oxide ceramic high-temperature superconductor material to provide a layer that adheres well between carrier and coating and chemical Reactions and interactions between carrier material and the oxide ceramic material prevented. For this intermediate layer is there among others Alumina provided that as an alcoholic Suspension is applied to the support surface and for the purpose of permanent connection with the carrier material 950 ° C is sintered.
Diese Bandleiter werden im Herstellungsverfahren bei entsprechend hohen Temperaturen bekanntermaßen gesintert, wobei diese Bandleiter bzw. ein Teilstück dieses langgestreckten Bandleiters (einige 100 m) spiralförmig auf einer Glühunterlage gewickelt und aneinanderliegend geglüht werden. Um ein Aneinanderkleben bzw. Haften der Bandleiter während der dafür erforderlichen Glühprozesse zu vermeiden, ist auf einem jeden einzelnen Bandleiter eine Beschichtung aus vorzugsweise Aluminiumoxid vorgesehen. Diese Maßnahme gewährleistet, daß ein Aneinanderkleben/Haften der Einzellagen/Windungen dieses Bandleiters bei hohen Temperaturen von größer 800°C, bei denen die mechanische Belastbarkeit des Silbers gering ist, verhindert wird.These tape conductors are used in the manufacturing process at known to be sintered at high temperatures Strip conductor or a section of this elongated strip conductor (some 100 m) spirally on a glow pad wrapped and annealed next to each other. To stick together or sticking of the band leader during the necessary Avoiding annealing processes is on everyone individual strip conductors a coating of preferably aluminum oxide intended. This measure ensures that a Sticking / sticking of the individual layers / turns of this Band conductor at high temperatures of greater than 800 ° C, at which the mechanical strength of the silver is low, is prevented.
Zur Herstellung eines Supraleiterkabels müssen die fertig prozessierten Bandleiter einzeln verwickelt und an entsprechenden Anschlüssen kontaktiert werden. Bei der elektrischen Kontaktierung des jeweiligen Endes eines solchen Supraleiter-Kabels mit Anschlüssen ist ein Miteinander-Verlöten von Kabelende und Anschluß erforderlich. Dazu müssen die einzelnen Bandleiter zuverlässig mit dem Anschluß verlötet werden können. Dem steht jedoch die ansonsten erforderliche Aluminiumoxid-Beschichtung der Bandleiter im Wege. Es ist daher erforderlich, einen Lösungsweg zu haben, der diese an sich bestehende Unvereinbarkeit behebt.To manufacture a superconductor cable, they must be ready processed band leader individually involved and on appropriate Connections can be contacted. With the electrical Contacting the respective end of such a superconductor cable with connections is a soldering together of cable ends and connection required. To do this, the individual Band conductors can be reliably soldered to the connection. However, the aluminum oxide coating that is otherwise required is sufficient the band leader in the way. It is therefore necessary to have a way of solving that existing in itself Fixed incompatibility.
Aus der EP 0803 917 A1 ist bekannt, eine Zwischenschicht aus Aluminiumoxid dadurch herzustellen, daß ein Teil des Aluminiums zur Grenzfläche zwischen Silber und Legierung diffundiert und dort oxidiert wird.An intermediate layer is known from EP 0803 917 A1 Produce aluminum oxide by part of the aluminum diffused to the interface between silver and alloy and there is oxidized.
Aufgabe der vorliegenden Erfindung ist es, einen Lösungsweg anzugeben, der ein Haften der Bandleiter aneinander während des Glühens verhindert und ein Löten für spätere Kontaktierung der Bandleiter erleichtert.The object of the present invention is a solution specify the sticking of the tape conductors to each other during prevents glowing and soldering for later contacting the band leader relieved.
Einen solchen Lösungsweg sowie Weiterbildungen und weitere
Ausgestaltungen desselben geben der Patentanspruch 1 und die
Unteransprüche an.Such a solution as well as further training and others
Refinements of the same give
Die vorliegende Erfindung sieht bei einem Herstellungsverfahren von Bandleitern für das nachfolgende Löten zwecks Kontaktierung der Bandleiter vor, eine gezielte Auswahl bezüglich des zu verwendenden Aluminiumoxids für die an sich notwendige Beschichtung der Bandleiter zu treffen. Es wurde festgestellt, daß eine ganz entscheidende Erleichterung für das nachfolgende Löten dadurch zu erzielen ist, daß man für die Ausführung dieser Beschichtung ein Aluminiumoxid in wässriger Suspension anwendet, wobei die in dieser Suspension fein verteilt enthaltenen Aluminiumoxidpartikel eine Teilchengröße beschränkt auf etwa 0,5 bis etwa 10 µm haben. Vorzugsweise wird die Suspension so aufgetragen, daß sie (zunächst) zu einer Schichtdicke bis (maximal) etwa 10 µm auf dem Bandleiter führt. Die ausgewählte wässrige Suspension bringt man z.B. in einem Durchlaufverfahren auf dem Silbermatrix-Bandleiter auf. Dazu empfiehlt es sich darauf zu achten, daß auf der Bandleiteroberfläche keinerlei (Reste von) Lösungsmittel(n) vorhanden sind, die zur Reinigung verwendet werden (könnten). Dies würde nämlich die Oberflächenspannung hinsichtlich der Suspension so weit erhöhen, daß eine nahezu geschlossene Beschichtung mit der vorgesehenen Suspension nicht mehr möglich ist. Ebenfalls sind grobe Verunreinigungen der Silberoberfläche zu vermeiden.The present invention provides a manufacturing process of tape ladders for that subsequent soldering for the purpose of contacting the strip conductor, a targeted selection regarding the aluminum oxide to be used for the necessary coating of the strip conductor hold true. It was found to be a crucial one Relief for the subsequent soldering To achieve is that one for the execution of this coating uses an alumina in aqueous suspension, where the finely divided aluminum oxide particles contained in this suspension a particle size limited to about 0.5 up to about 10 µm. The suspension is preferably so applied that they (initially) up to a layer thickness (maximum) about 10 µm leads on the ribbon conductor. The selected one aqueous suspension is brought e.g. in a continuous process on the silver matrix ribbon conductor. It recommends this make sure that there is nothing on the surface of the strip conductor (Remnants of) solvent (s) are present which are used for Cleaning (could) be used. This would be the Increase the surface tension with regard to the suspension so far that an almost closed coating with the intended Suspension is no longer possible. Also are to avoid coarse contamination of the silver surface.
Es kann auch vorgesehen sein, die mit der Suspension auf dem Bandleiter zu erzeugende Aluminiumoxid-Beschichtung so dünn herzustellen, daß diese porös ist. Eine solche Porosität kann insbesondere auch dazu dienen, mit dem nachträglich anzuwendenden Lot das Material des Bandleiters elektrisch direkt zu kontaktieren, ohne diese aufgebrachte Schicht vorher mechanisch zu beeinflussen.It can also be provided with the suspension aluminum oxide coating to be produced on the strip conductor so thin that it is porous. Such porosity can also serve, in particular, with the subsequent to be applied solder the material of the strip conductor electrically to contact directly without this upset To influence layer mechanically beforehand.
Auch aus ökologischen Gründen ist es von Vorteil, erfindungsgemäß eine wässrige Suspension anzuwenden.According to the invention, it is also advantageous for ecological reasons apply an aqueous suspension.
Die wie voranstehend beschriebene Suspension wird, auf der Oberfläche des jeweiligen Bandleiters aufgebracht und bei Temperaturen von mehr als 100°C, z.B. von ca. 600°C, in einem Durchlaufofen oder dgl. getrocknet.The suspension as described above is on the Surface of the respective strip conductor applied and at Temperatures of more than 100 ° C, e.g. of approx. 600 ° C, in one Continuous furnace or the like. Dried.
Bevorzugt ist, Aluminiumoxid zu verwenden, das in den Tonerdepartikeln Kristallwasser enthält. Bei der beschriebenen Anwendung hoher Temperatur führt dies dazu, daß bei Temperaturen über 500°C ein Ausgasen des Kristallwassers stattfindet, was auch zu einer gewissen Porosität der fertigen Aluminiumoxidbeschichtung führen kann. Auch führt dies dazu, daß die Hafteigenschaften der Aluminiumoxidpartikel der Beschichtung auf der Silberoberfläche des Bandleiters erfindungsgemäß weniger fest ist und anschließend, nämlich für das nachfolgende Löten, aber auch zwischen den einzelnen Glühbehandlungen, durch eine mehrere Minuten andauernde Ultraschallbehandlung an der Lotstelle in einfacher Weise wieder entfernt werden kann.It is preferred to use alumina contained in the alumina particles Contains crystal water. In the application described high temperature this means that at temperatures Outgassing of the crystal water takes place above 500 ° C, which also leads to a certain porosity of the finished aluminum oxide coating can lead. This also leads to the fact that the adhesive properties of the aluminum oxide particles of the coating on the silver surface of the strip conductor according to the invention is less solid and then, namely for the following Soldering, but also between the individual annealing treatments, through an ultrasound treatment lasting several minutes can be easily removed at the solder point can.
Es kann von Vorteil sein, den Bandleiter, d.h. das Silber, vor dem Aufbringen der Suspension leicht aufzurauhen/anzurauhen. Nach Aufbringen/Herstellen der Beschichtung und vor dem Löten kann es von Vorteil sein, den jeweiligen Bandleiter an der Lotstelle mit Lösungsmitteln, Säuren oder ähnlichem, insbesondere mit Aceton, zu reinigen und das Lot direkt aufzubringen.It may be of advantage to use the strip conductor, i.e. the silver, roughen / roughen slightly before applying the suspension. After application / production of the coating and before soldering it can be beneficial to each Band leader at the solder point with solvents, acids or the like, especially with acetone, and clean the solder to apply directly.
Es kann auch vorgesehen sein, den jeweiligen Bandleiter auf seiner gesamten Länge nach dem erfolgten Sintern desselben wieder wenigstens zu einem Anteil von der (nach dem Sinterprozeß des Bandleiters nicht mehr erforderlichen) Aluminiumoxidbeschichtung zu befreien. Dies nämlich dazu, um dann den Bandleiter in einem Durchlaufverfahren auf seine Eigenschaften hin untersuchen zu können und die Möglichkeit zu haben, seine mechanischen und/oder elektrischen Eigenschaften durch bekannte nachträgliche Eindiffusion von Fremdmetallen in das Silber noch verbessern bzw. egalisieren zu können.Provision can also be made for the respective strip conductor its entire length after it has been sintered again at least in part from the (after the sintering process of the strip conductor no longer required) aluminum oxide coating to free. This is because of this, then the Strip conductor in a continuous process on its properties to be able to examine and have the opportunity its mechanical and / or electrical properties known subsequent diffusion of foreign metals into the To be able to improve or even equalize silver.
Das nachfolgend beschriebene Fließbild soll eine Übersicht
zum erfindungsgemäßen Verfahren geben. In der Stufe 1 erfolgt
bekanntermaßen das Zusammenbringen, Pressen, Strangziehen und
dgl. des noch nicht gesinterten Bandleiters in eine Silbermatrix.
In der zweiten Stufe erfolgt das nach erfindungsgemäßer
Auswahl des Aluminiumoxids und der Verfahrensparameter vorzunehmende
Beschichten des Bandleiters mit der erfindungsgemäß
wässrigen Aluminiumoxid-Suspension mit erfindungsgemäßer Partikelgröße.The flow diagram described below is intended to provide an overview
give to the inventive method. In
In der dritten Stufe erfolgt das Eintrocknen der Suspension zur Herstellung der Feststoff-Beschichtung.In the third stage, the suspension dries out for the production of the solid coating.
Die vierte Stufe sieht das mindestens einmalige, insbesondere aber auch mehrmalige Sintern des spiralförmig angeordneten Bandleiters bzw. der Bandleiterbündel vor.The fourth stage sees this at least once, in particular but also multiple sintering of the spirally arranged Tape leader or the tape conductor bundle.
Die fünfte Stufe betrifft das Freilegen der Bandleiterenden und Kontaktlöten der Bandleiter miteinander und bzw. mit dem Anschlußteil am Kabelende. The fifth stage concerns the exposure of the tape conductor ends and contact soldering the strip conductors to one another and / or to the Connection part at the end of the cable.
Während der vierten, d.h. nach den einzelnen Glühbehandlungen, als auch zwischen der vierten und fünften Stufe kann fakultativ gemäß einer Weiterbildung der Erfindung eine wie beschriebene Ultraschall-Behandlung der Bandleiterenden eingeschoben sein.During the fourth, i.e. after the individual annealing treatments, as well as between the fourth and fifth levels can be optional according to a development of the invention as described Ultrasound treatment of the tape conductor ends inserted his.
Claims (15)
- Method of producing high-temperature superconducting silver-matrix strip conductors for high-temperature superconducting cables with an at least temporary aluminium oxide coating, characterised in that aluminium oxide in the form of an aqueous suspension of finely distributed aluminium oxide particles having a particle size of 0.5 to 10 µm is applied to strip conductors to a layer thickness of up to 10 µm and the suspension adhering to the strip conductor is then dried at temperatures in excess of 100°C.
- Method according to claim 1, characterised in that drying is carried out essentially at temperatures of 600°C.
- Method according to claim 1 or claim 2, characterised in that, prior to the application of the suspension, the strip conductors to be coated are cleaned, avoiding the use of acetone or alcoholic solvents.
- Method according to claim 1, 2 or 3, characterised in that the respective strip conductor is slightly roughened prior to the application of the suspension.
- Method according to claim 1, 2, 3 or 4, characterised in that, prior to soldering with solder at a soldering point, the already coated strip conductor is cleaned with solvent at the soldering point and the solder is applied directly to this soldering point.
- Method according to claim 5, characterised in that acetone is used as the solvent.
- Method according to claim 1, 2, 3 or 4, characterised in that, prior to soldering with solder at a soldering point, the already coated strip conductor is cleaned with acid at the soldering point and the solder is applied directly to this soldering point.
- Method according to one of claims 1 to 7, characterised in that aluminium oxide in the form of alumina particles containing water of crystallisation is used and the water of crystallisation is exhausted from the alumina coating applied at temperatures in excess of 500°C.
- Method according to one of claims 1 to 8, characterised in that the coating is sintered on the strip conductor at temperatures of up to 900°C.
- Method according to one of claims 1 to 8, characterised in that the coating is sintered on the strip conductor at temperatures of up to 820°C.
- Method according to one of claims 1 to 10, characterised in that ultrasound is used to remove at least part of the aluminium oxide coating from the strip conductor.
- Method according to claim 11, characterised in that the ultrasound is used for removal at intended soldering points.
- Method according to one of claims 1 to 11, characterised in that, after the sintering of the silver matrix of the strip conductor containing the superconducting material, the coating is removed from the entire strip conductor once again.
- Method according to claim 13, characterised in that, after the removal of the coating, foreign metals are diffused into the material of the strip conductor.
- Method according to one of claims 1 to 10, characterised in that the aluminium oxide coating produced is so thin that it is porous in such a manner that solder to be applied subsequently directly contacts the material of the strip conductor without machining.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19815096A DE19815096C2 (en) | 1998-04-03 | 1998-04-03 | Coating process to be used in the manufacturing process of high-temperature superconducting strip conductors |
| DE19815096 | 1998-04-03 | ||
| PCT/DE1999/000962 WO1999052156A1 (en) | 1998-04-03 | 1999-03-30 | Coating method for use in a process for producing high-temperature supraconductive strip conductors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1082766A1 EP1082766A1 (en) | 2001-03-14 |
| EP1082766B1 true EP1082766B1 (en) | 2003-08-13 |
Family
ID=7863569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99944141A Expired - Lifetime EP1082766B1 (en) | 1998-04-03 | 1999-03-30 | Coating method for use in a process for producing high-temperature supraconductive strip conductors |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6572916B1 (en) |
| EP (1) | EP1082766B1 (en) |
| JP (1) | JP2002510849A (en) |
| DE (2) | DE19815096C2 (en) |
| WO (1) | WO1999052156A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004014596A1 (en) * | 2004-03-23 | 2005-10-27 | Trithor Gmbh | Non-stick coating for the production of composite material wires |
| DE102009028174A1 (en) | 2009-07-31 | 2011-02-03 | Bruker Hts Gmbh | Producing powder-in-tube-high-temperature superconductor-wire with noble metal sheath made of silver/silver alloy, by coating semi-finished product of wire with separating agent, and applying aqueous suspension of agent on product surface |
| DE102010041595A1 (en) | 2010-09-29 | 2012-03-29 | Siemens Aktiengesellschaft | Arrangement and method for electrically contacting electrical conductors in coils |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3168609D1 (en) * | 1980-07-15 | 1985-03-14 | Imi Kynoch Ltd | Flexible insulation for filamentary intermetallic superconductor wire |
| DE3744145A1 (en) * | 1987-12-24 | 1989-07-06 | Asea Brown Boveri | SUPER LADDER AND METHOD FOR THE PRODUCTION THEREOF |
| JPH01251519A (en) * | 1988-03-31 | 1989-10-06 | Fujikura Ltd | Insulation process for oxide superconductive wire |
| JPH04355012A (en) * | 1991-05-31 | 1992-12-09 | Hitachi Ltd | Manufacture of oxide superconductive wire rod |
| JPH06243745A (en) * | 1992-08-26 | 1994-09-02 | Sumitomo Electric Ind Ltd | Manufacture of high temperature superconducting wire material and high temperature superconducting coil |
| JPH0757570A (en) * | 1993-08-11 | 1995-03-03 | Mitsubishi Cable Ind Ltd | Manufacture of oxide superconducting insulated coil and raw material thereof |
| JPH07153619A (en) * | 1993-11-26 | 1995-06-16 | Tokin Corp | Manufacture of superconducting coil |
| JPH09232131A (en) * | 1996-02-23 | 1997-09-05 | Hitachi Cable Ltd | Winding spacer for oxide superconductor wire |
| FR2747831B1 (en) * | 1996-04-22 | 1998-05-22 | Alsthom Cge Alcatel | MULTIFILAMENT HTC SUPERCONDUCTING STRAND AND A METHOD FOR MANUFACTURING SUCH A STRAND |
-
1998
- 1998-04-03 DE DE19815096A patent/DE19815096C2/en not_active Expired - Fee Related
-
1999
- 1999-03-30 JP JP2000542807A patent/JP2002510849A/en active Pending
- 1999-03-30 DE DE59906599T patent/DE59906599D1/en not_active Expired - Lifetime
- 1999-03-30 EP EP99944141A patent/EP1082766B1/en not_active Expired - Lifetime
- 1999-03-30 WO PCT/DE1999/000962 patent/WO1999052156A1/en active IP Right Grant
- 1999-03-30 US US09/647,564 patent/US6572916B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59906599D1 (en) | 2003-09-18 |
| JP2002510849A (en) | 2002-04-09 |
| DE19815096A1 (en) | 1999-10-14 |
| DE19815096C2 (en) | 2000-05-11 |
| EP1082766A1 (en) | 2001-03-14 |
| US6572916B1 (en) | 2003-06-03 |
| WO1999052156A1 (en) | 1999-10-14 |
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